# At a given moment, a plane passes directly above a radar station at an altitude of 6 km. (a) The plane’s speed is 800 km/h. How fast is the distance between the plane and the station changing half a minute later? (b) How fast is the distance between the plane and the station changing when the plane passes directly above the station?

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At a given moment, a plane passes directly above a radar station at an altitude of 6 km.
(a) The plane’s speed is 800 km/h. How fast is the distance between the plane and the station changing half
a minute later?
(b) How fast is the distance between the plane and the station changing when the plane passes directly above
the station?

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